Compressive strength-after-impact

Compressive strength after impact (MPa) Open-hole compressive strength (MPa) 332... 

As can be seen from the results, the composite formed from monomer/-polymer 114a with Celion G30-500 8HS fabric exhibited excellent mechanical properties [28], To a first approximation it would appear that the inherent fracture toughness of the matrix resin has been carried over to the composite panels. The CAI (compressive strength after impact) and OHC (open hole compression) tests are a direct measurements of the toughness of the composite part, the value of 332 MPa for the CAI compares very favorably to the value of 300 MPa typical for the thermoplastic composites. The OHC values under hot-wet test conditions would seem to indicate that the composite has very good retention of its mechanical properties at both 177°C and 203 °C. 

OHT open-hole tensile OHC open-hole compression CAI compression strength after impact EDS edge delamination strength. (Adapted from Table 4 in Pilato, L.A. Michno, M.J. Advanced Composite Materials Springer-Verlag Berlin, 1994 118.)... 

Edge-plate compression strength after impact, at room temperature... 

Reinforced Plastics Congress, British Plastics Federation, London, Paper No. 19, pp 145-151 Russell AJ, Street KN (1985) Moisture and temperature effects on the mixed-mode delamination fracture of unidirectional graphite/epoxy. Delamination and debonding of materials, ASTM 537 STP 876, American Society for Testing and Materials, Philadelphia, pp 349-370 Saito H, Kimpara I (2007) Effect of water absorption on compressive strength after impact and post impact fatigue behavior of woven and knitted CFRP laminates. Key Eng Matra-334-335 517-520... 

The compression after impact (CAI) test was conducted to evaluate the residual strength after impact and the healing efficiency after confined shape recovery. Previous studies [70,71] have... 

It is critical that surface treatment conditions be optimized to composite properties since overtreatment as well as undertreatment will degrade composite properties. Typically composite interlaminar shear strength (ILSS), in-plane shear, and transverse tension ate used to assess the effectiveness of surface treatment. More recently damage tolerance properties such as edge delamination strength, open hole compression, and compression after impact have become more important in evaluating the toughness of composite parts. 

Fig. 8.8. Correlation of residual compression-after-impact (CAI) strength with resin flexural strain to...

Farley. G.L. and Dickinson. L.C. (1992). Removal of surface loop from stitched composites can improve compression and compression-after-impact strengths. J. Reinforced Plast. Composites 11. 633-642. 

FIGURE 2.59 Impact of Ti02 quantity on RubCon compressive strength operated in no aggressive environments (line 1), resistance coefficient (line 2), and compressive strength (line 3) after 90 days exposure to 36% solution of HC1. (Reprinted from Yu. Potapov, Yu. Borisov, V. Chmyhv, and D. Beilin, Research of Polymer Concrete Based on Low Molecular Polybutadiene, Part VIII Chemical Resistance of Polymer Concrete, J. Scientific Israel Technological Advantages 7, nos. 1-2 (2005) 72-78. With permission.)... 

A recent study [17] subjected a population of samples of quasi-isotropic (QI) CFRP laminate to identical impacts and then to residual strength tests to measure the CAI. Significant variability in CAI values was found. The coefficient of variation (CoV — the standard deviation/mean) of the compression strength increased from 1.8% before impact to 5.4% after impact. Fitting the distribution of strength to a... 

Figure 9.12 Normalised stress versus cycles for failure with compression stress normalised against compression after impact strength 25% and 50% refer to damage as a % of sample width.

Davies GAO, Hitchings D. The separate roles of fibre damage and delamination in compression-after-impact strength of composite panels. In 5th EUROMECH Solid mechanics Conf. Thessaloniki, Greece 2003. 

The resin has good adhesion to glass and carbon fibers and shows a lower coefficient of thermal expansion than epoxies and most plastics. As a matrix resin in a carbon composite, PEAR is said to surpass epoxy (Hercules/Hexcel 3501-6) by 48% in tensile, compression, hot/wet, compression-after-impact, and other fiber-dominated properties. Shear strength (matrix-dominated property) is reported at 50% higher than epoxy at room temperature and up to 80% higher under hot-wet conditions. 

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